Knife-switch.



G. B. THOMAS. KNIFE SWITCH.

APPLICATION FILED MAY as, 1908. Y

WITNESSES INVENTOR lg? 155 2: {w

ATTORNEYS Patented Jan. 19, 1909,

UNITED STATES PATENT OFFICE.

GEORGEB. THOMAS, OF BRIDGE PORT, CONNECTICUT, ASSIGNOR TO THE BRYANT ELECTRIC COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

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Patented Jan. 19, 1909.

i To all whom it may concern:

. my improvement; Fig. 2'is a Be it known that I, GEORGE B. THOMAS, a citizen of the United States of America, re-

siding in the city of Bridgeport, in the county of Fairfield, in the State of Connecticut, have invented certain new and useful Improvements Knife-Switches, of which the following is a specification.

The object of my invention is to simplify and cheapen the construction of electrical knife switches, in respect to the manner of mounting and hingin the blades, and this gliltlhout-diminishing their eificiency or duray I k I v In the accompanying drawin s Fi ure 1 is a 'side elevation of a knife switc em odying erspective viewv showing the parts detache Fig. 3 is an end view also showing the parts detached; Fig. 4 is a side elevation, showing a modification; Fig. 5 is a planview showing the parts of. this modified construction detached; Fig. dis a plan view of another modification.

Referring to Fig. 1, A .is theinsulating base, 0 is one of the hinging posts for a blade B of the switch, C is a contact ost, and H is the insulating handle secure to the free end or ends of the blade or blades B.

The blades and hinging and contact posts are made of sheet or strip metal and elther the blade or the post will be made with two leaves or folds to embrace a single leaf on the other art,

In igs. 1 to 5, I havesho'wn, and I prefer to use, two-leaf posts and single leaf blades.

"Thus each post 0 or C is formed of a flat strip of metal folded-or bent up and riveted at z to have its free ends 0, c, embrace the sin le leaf blade B.

I n the usual construction, the hinging of the blade to the post C is effected by 'the use of a screw, )9. sprin washer and two nuts,

one of which is a ock nut. According to. this invention I simp the construction by splitting either the en of the blade or the outer end of'the post and offsetting the s lit ends so 'as to constitute a spring friction etween these parts.

InFigs. 1, 2 and 3, I have shown the end of the blade B as split at b and the split ends --pressed out of line with each other or offset as shown in Figs. 2 and 3, so that when these press the two parts of the cli ends 0 the clip C, and means are'applied to to ether to press the oflset split ends of t e bade into ine, there will "be produced the desired spring frictional hold at the hinge.

ofiset arts are introduced between the free In Figs. 2 and 3, I have shown a holding at?) and ofl'set, the unslit but perforated end of the blade B being introduced between the ends of the clip,-and then a hinging means applied. By way of example, I have shown a rivet pin 11) with washer e, over which the end of the pin is riveted.

I In Fig. 6, I have shown a single'blade binding post C split and oil'set when uncon.

fined, but embraced between the two leaves of a blade 15 and held by a hinge pin E with nut and washer.

- I claim as my invention- 1. An electric knife switch having 'a blade and hinging post both of fiat metal, and one having two leaves to embracethe end of the other, and one having a split oii'set end and means to press the parts together at the hinge, as and forthepurpose described.

2. An electric knife switch having a blade with its hinging end split and offset, in combination with a hinging ost in the form of a clip-to embrace the s ht end of the blade, and means to press t e oil'set parts of the bladebetween the-parts of the clip.

3. An electric knife switch having a blade with its hinging end oil'set in combination with a hinging post in the form of a clip to embrace the oiT'set end of'the. blade and a rivet assing through-the' ends of the-clip and b ade and pressing the of? set parts of the blade between the parts of the clip.

Intestimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

GEORGE B. THOMAS.

Witnesses:

F. E. SEELEY, A. H. Jones. 

